Improvement in sand-sifting machines



J. D. HOBBS. Sand-Sifting Machine.

No. 214,040. Patented April 8,1879.

Invert 607. M M

N.PEFERS, FHOTKILITHUGRAPHER, WASHXNGTON. D C.

UNITED STATES PATENT OFFICE.

JOSEPH D. HOBBS, OF MEDIAPOLIS, IOWA.

IMPROVEMENT IN SAND-SIFTING MACHINES.

Specification forming part of Letters Patent N0- 2l4,0 10, dated April8, 1879; application filed June 14, 1878.

To all whom it may concern:

Be it known that I, JOSEPH D. HoBBs, of Mediapolis, in the county of DesMoines, State of Iowa, have invented a new and useful Improvement inSand Sifting Machines, of which the following is a specification.

My invention relates to machines for sifting sand; and has for itsobject to provide a machine, to be operated by a crank, that will beeasy of movement and thorough in its work.

It consists in a sieve and sieve-frame operated by a cam-wheel, andarranged in connection with slotted and rocking bars and an oscillatin gbar provided with prongs, which enter the sand in the hopper, all ofwhich will be more fully described hereinafter.

In my drawings, Figure 1 is a vertical section. Fig. 2 is a plan view ofmy machine.

Similar reference letters indicate like parts in all of the figures.

Referring to drawings, A is the hopper, which is nearly square at thetop, with its sides vertical and ends inclined inward toward its chute.B B are legs attached to the side pieces of the hopper.

Below the hopper Ais the sieve, fixed in the frame 0, which is supportedby two swinging bars, F, pivoted outside of the vertical sides of thehopper. These swing-bars are provided with holes for a proper adjustmentof the sieveframe to give the required movement to the gravel or coarsesand toward the end of the sieve.

A platform, L, held in position by suitable hooks, is provided toreceive the gravel and slide it out of the way of the sand which fallsthrough the sieve J. The sieve J is fixed in the frame 0, which isgrooved in its inner edge.

A bolt, K, which passes through the outer ends of the frame 0, serves toclamp it and hold the sieve in place.

The upper end of the sieve-frame has a rod or bar, E, which is providedwith a slot in its end, fashioned to receive the rim of the crank ordriving wheel D, which serves the purpose of a cam as it moves in saidslot to vibrate the sieve-frame. A strip, G, passing between two of thelegs of the sifter, forms a loop, through which the rod or bar E movesas it is vibrated.

The driving-wheel D is hung upon the shaft T, which is journaled insuitable bearings 0 S of the hopper A. Said wheel, which is turned trueon its circumferential edge, is irregular laterally with reference tothe hopper, as previously described, to act as a cam and give avibrating movementto the sieve.

A cross-bar, N, secured to the vertical sides of the hopper, serves as asupport to the loop or strip G. The bars F, between which the sieve ishung, being limited in their movement by a given radius, impart to thesieve-frame as it vibrates a vertical movement, to prevent the wire ofthe sieve from holding the gravel which might lodge in its passageoutward.

W is an oscillating bar, j ournaled in the sides of the hopper, whichhas attached to it arms, provided with balls U and prongs V, intended topenetrate the sand in the hopper, and prevent it from lodging in itsthroat. A slide, H, is fitted in grooves in the sides of the hopper, andhas attached to it, on its under side, a lever, I, which is within reachof the hand, by which said slide may be moved to regulate the feed ofthe hopper.

The wheel D has fixed in its rim a gudgeon, upon which is placed anordinary crank, I which may be adjusted to give more or less leverage inoperating said wheel D.

My machine is operated as follows: The crank 1? being properly fixed,the wheel D is moved, and by its rim passing through the groove in thebar E a lateral movement is given to the frame 0. The bars F, havingfixed axes and being attached to frame 0, lift and lower said frame asit moves laterally. Pins on either side of frame 0 coming in contactwith the arms of the oscillating bars cause them to move and drive theprongs V out of the sand and gravel in the throat of the hopper. Whensaid pins release the arms of the oscillating bar the balls U gravitateand force the prongs V into the mass in the throat of the hopper, andloosen it, so as to assist it in falling through to the sieve. The finesand passes through the meshes of the sieve and falls to a platformprovided to receive it, while the coarser sand and gravel drop from themouth of the sieve and into the platform L, and thence to the ground.

Having thus described my invention, what I claim as new, and desire tosecure by Let- 2. The oscillating bar W, provided with tel-s Patent,isprongs V and weighted balls U, in combine- 1. The sieve J andsieve-frame C, in combition with sieve-frame, as and for the purposenation with the mechanism by which their set forth.

movement is obtained-viz., the slotted bar E, JOSEPH D. HOBBS. attachedto the sieve-frame, wheel D, and roek- Witnesses ing bar F, all arrangedas described, for the WM. HARPER,

purpose set forth. JOHN GORDER.

